Dual-gratings with a Bragg reflector for dielectric laser-driven accelerators

Wei, Y, Xia, G, Smith, JDA and Welsch, CP ORCID: 0000-0001-7085-0973 (2017) Dual-gratings with a Bragg reflector for dielectric laser-driven accelerators. PHYSICS OF PLASMAS, 24 (7). 073115-.

Text paper.pdf - Author Accepted Manuscript Download (2MB)

Abstract

<jats:p>The acceleration of a beam of electrons has been observed in a dielectric laser-driven accelerator with a gradient of 300 MV/m. It opens the way to building a particle accelerator “on a chip” much more cheaply than a conventional one. This paper investigates numerically an efficient dielectric laser-driven accelerating structure, based on dual-gratings with a Bragg reflector. The design of the structure boosts the accelerating field in the channel, thereby increasing the accelerating gradient by more than 70% compared to bare dual-gratings, from analytical calculations. This is supported by two-dimensional (2D) particle-in-cell simulations, where a 50 MeV electron bunch is loaded into an optimized 100-period structure to interact with a 100 fs pulsed laser having a peak field of 2 GV/m. It demonstrates a loaded accelerating gradient of 1.48 ± 0.10 GV/m, which is (85 ± 26)% higher than that of bare dual-gratings. In addition, studies of the diffraction effect show that the optimized structure should be fabricated with a vertical size of J/wx ≥ 0.20 in order to generate an acceptable accelerating performance.</jats:p>

Item Type:	Article
Depositing User:	Symplectic Admin
Date Deposited:	14 Jul 2017 08:08
Last Modified:	15 Mar 2024 11:03
DOI:	10.1063/1.4993206
Related URLs:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3008455